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Oh OK, you were talking about a Desktop/Gnome panel and not a Nautilus side pane.

I've done like you said, and it fact it's working great and certainly the best workaround so far, thank you very...

@gadolinio

I've create a launcher pointing to your script, it works fine but I don't know how to make it easily accessible in the side panel as you propose, could you please advise?

Thanks